<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>007-svg视区盒子.html</title>
	<style>
		*{
			margin: 0;
			padding: 0;
		}
		svg{
			background-color: gray;
		}
	</style>
</head>
<body>
	<svg width="600" height="400" viewBox="0 0 60 40">
		<rect width="30" height="20" />
	</svg>
</body>
</html>